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Quick Guide to Maintenance Coolant liquid Coolant liquid -30ºC Crankcase oil (10w40) 500 cc. Electrode separation 0.6 mm. Forks suspension oil SAE 5 (Summer) SAE 2.5 (Winter) Fork suspension oil quantity200 cm3 Shock absorber spring length96 mm Front wheel pressure Standard 0.400 bar Competition 0.370 bar Rear wheel pressure Standard 0.350 bar Competition 0.300 bar -9- 1 Fuel – Petrol/oil mixture The motorcycle is fitted with a two-stroke internal combustion engine. This type of engine requires a mixture of petrol and oil. To ensure the correct working of the engine, the following are recommended: – Use high quality petrol, with an octane rating equal to or above 90 (RON + MON)/2 or 98 (RON). – Use 2T synthetic oil. Warning: – If the recommended oil is not available, use semi-synthetic oil. – Do not mix different oil-types. Mixture ratio: oil, 1.5% of petrol volume (50 parts petrol to every 0.75 part oil). Note: we recommend first preparing the mixture in a suitable container and then filling the fuel tank. Fuel tank This has a rapid access cap A and a vent hose B to allow gases produced in the tank to escape. – To open the cap, lift the clip in the direction shown by the arrow and turn to the left. Warning! Regularly check the cap seal and vent hose to ensure they are leak proof. Risk of spillage. -10- 3 2 Reserve Open Closed Fuel tap This has three positions: open, closed and reserve. The diagrams below show the position of tap A for each case. A Gear shift The motorcycle has a two- speed gearbox, which may be selected manually when the motorcycle is stationary, by moving the lever A in a horizontal direction, as shown by the arrow. Note: Select the gear according to the characteristics of the track

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INSTALLATION 1. Prior to installing the gas cap on the vehicle, insert the key into the lock. Firmly grasp the chrome top of the fuel cap and turn the key until it stops. On right hand threaded fuel caps, turn the key counter-clockwise until it stops. On left hand threaded fuel caps, turn the key clockwise until it stops. This assures an unlocked position for the gas cap. Allow the key to return to the neutral position. 2. Remove the key and install the fuel cap on the vehicle. is00770 Figure 1. Right Hand Threaded Fuel Cap Installation NOTE When installing the fuel cap, rotate the cap one full turn past the audible click. This automatically positions gas cap to lock position. A properly locked/installed gas cap will rotate freely in both directions. Failure to do so will give an incorrect assumption that the fuel cap does not work properly. REMOVAL On right hand threaded fuel caps, insert key, and while holding the gas cap in place with hand, turn key counterclockwise until it stops, return key to original position. Gas cap must rotate 270 degrees counter-clockwise before mechanism engages to allow gas cap removal. Continue to rotate counterclockwise to fully remove gas cap. On left hand threaded fuel caps, insert key and while holding the gas cap in place with hand, turn key clockwise until it stops, return key to original position. Gas cap must rotate 270 degrees clockwise before mechanism engages to allow gas cap removal. Continue to rotate clockwise to fully remove gas cap. REPLACEMENT KEYS Record the 4 digit key number stamped on the back of the key opposite the Harley-Davidson logo, in the area provided below. If a replacement key is needed, see your Harley-Davidson Dealer with the 4 digit number to order a replacement

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top out” too easily and fail to allow enough travel for appropriate rebound from bumps. If the ride height is too low, the shock can bottom too easily, resulting in a harsh ride. The spring rates are set up for the full amount of travel. If the preload is too little, the combined rate is not enough to resist bottoming. Generally speaking, the vehicle should settle 1/4 to 1/3 of its wheel travel with the rider on board for off road use. The proper way to measure the ride height: 1. Support the vehicle on a frame stand or center stand with the rear wheel clear of the ground. 2. Have an assistant measure and record the vertical distance between the rear axle and a point directly above it (seat, fender, frame, muffler, etc.). 3. Take the motorcycle off the stand and sit on it in a normal riding posture, with one foot on the peg and the motorcycle balanced so as to have minimal weight on your other foot. 4. Have the assistant carefully measure from the same two points. Subtract the second measurement from the first. The difference is the amount of settling or “sag.” NITROGEN PRESSURES CAUTION: The pressure in these shocks cannot successfully be checked. Concerns with the gauge volume and the gas volume in the shock body create a situation where you cannot accurately determine what pressure was in the shock. In addition, the gas is in a column on top of the oil, and when the pressure is lowered (i.e. checking the pressure) the gas will emulsify into the oil. This will cause the gas and some of the shock oil to escape into the gauge. It is possible to lose a large percentage of the shock oil by depressing the core of a charged shock to the atmosphere. Please note that in order to check the pressure, some of the gas must escape and fill the gauge assembly. The volume of the gas pocket is about the size of your thumb, so a very small volume change results in a large pressure drop. Because the gauges’ volumes vary, it is not possible to deduce the actual pressure in the shock prior to attaching the gauge. Therefore it is imperative that any attempt to check pressure be accompanied by the capability of refilling the shock. In other words: If you don’t have a nitrogen source handy, don’t check the pressure

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Definitions: Grounding : The process of making an electrical connection to the general mass of the earth. This is most often accomplished with ground rods, ground mats or some other grounding system. Low resistance grounding is critical to the operation of lightning protection techniques. Bonding : The process of making an electrical connection between the grounding electrode and any equipment, appliance, or metal conductor: pipes, plumbing, flues, etc. Equipment bonding serves to protect people and equipment in the event of an electrical fault. Equipotential Bonding : The process of making an electrical connection between the grounding electrode and any metal conductor: pipes, plumbing, flues, etc., which may be exposed to a lightning strike and can be a conductive path for lightning energy towards or away from the grounding electrode. 2. The National Fuel Gas Code NFPA 54/ANSI Z223 states, “Each above ground portion of a gas piping system upstream from the equipment shutoff valve shall be electrically continuous and bonded to any grounding electrode, as defined by NFPA 70, National Electrical Code ( ANSI/NFPA 70 1999 Edition.) 3. The TracPipe® gas piping system shall be bonded in accordance with the National Fuel Gas Code, NFPA 54/ANSI Z223. The piping system is not to be used as a grounding conductor or electrode for an electrical system. 4. For bonding of the TracPipe® system, a bonding clamp must be attached to the brass AutoFlare®fitting adapter (adjacent to the pipe thread area – see Figure 4-21) or to a black pipe component (pipe or fitting) located in the same electrically continuous gas piping system as the AutoFlare®fitting. The corrugated stain- less steel portion of the gas piping system SHALL NOT be used as the bonding attachment point under any circumstances. Bonding electrode conductor sizing shall be in accordance with Article 250 (Table 250-66) of ANSI/NFPA 70. The bonding is a requirement of the National Electrical Code

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This manual is intended as a guide for users of Mikuni carburetors who want to learn the adjusting method to the best performance from our products. In motorcycles, special tuning of the engine is now considereda routine practice. The arrows that appear in the drawings in this text show the direction in which air, fuel and an air-fuel mixture flows, respectively. ¢JAir Fuel “Mixture Mounting angle fore and aft inclination of the carb should not exceed approx Function of a carburetor The function of a carburetor is to produce combustible air-fuel mixture, by breaking fuel into tiny particles (in the form of vapor) and by mixing the fuel with air in a proper ratio, and to deliver the mixture to the engine. A proper ratio (mixture ratio or air-fuel ratio) means an ideal air-fuel mixture that can burn without leaving an excess of fuel or air, Whether the proper mixture ratio is maintained or not holds the key to the efficient engine operation, 2. Air-fuel mixture required by the engine (Fig. 1) The ratio of a mixture of fuel and air is called the mixture ratio or the air-fuel ratio and is generally expressed by the weight proportion. Theoretically, the amount of air required for complete combustion of 1 gram of fuel under normal conditions is

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Repair manual KTM 250 / 300 / 380 Art No 3206004 -E 2-2C main jet jet needle jet needle air control screw idle adjusting screw idle jet throttle valve Idling range A Operation with closed throttle valve. This range is influenced by the position of the air control screw 1 and the idle adjusting screw 2 . Only make adjustments when the engine is hot. To this end, slightly increase the idling speed of the engine by means of the idle adjusting screw. Turning it clockwise produces a higher idling speed and turning the screw counterclockwise produces a lower idling speed. Create a round and stable engine speed using the air control screw (basic position of the air control screw = open by 1.5 turns). Then adjust to the normal idling speed by means of the idle adjusting screw. Opening up B Engine behavior when the throttle opens. The idle jet and the shape of the throttle valve influences this range. If, despite good idling-speed and part-throttle setting, the engine sputters and smokes when the throttle is fully opened and develops its full power not smoothly but suddenly at high engine speeds, the mixture to the carburetor will be too rich, the fuel level too high or the float needle is leaking. Part-throttle range C Operation with partly open throttle valve. This range is only influenced by the jet needle (shape and position). The optimum part-throttle setting is controlled by the idling setting in the lower range and by the main jet in the upper range. If the engine runs on a four-stroke cycle or with reduced power when it is accelerated with the throttle partly open, the jet needle must be lowered by one notch. If then the engine pings, especially when accelerating under full power at maximum engine revs, the jet needle should be raised. If these faults should occur at the lower end of the part throttle range at a four-stroke running, make the idling range leaner; if the engine pings, adjust the idling range richer. Full throttle range D Operation with the throttle fully open (flat out). This range is influenced by the main jet and the jet needle. If the porcelain of the new spark plug is found to have a very bright or white coating or if the engine rings, after a short distance of riding flat out, a larger main jet is required. If the porcelain is dark brown or black with soot the main jet must be replaced by a smaller one. mixture too rich: too much fuel in proportion to air mixture too lean: not enough fuel in proportion to air 1 2 OPERATING RANGES OF THE CARBURETOR 2-3C Carburetor adjustment Basic information on the original carburetor setting The original carburetor setting was adapted for an altitude of approx. 500 meters (1600 ft.) above sea level, and the ambient temperature of approx. 20°C (68°F), mainly for off-road use and central European premium-grade fuel (ROZ 95 MOZ). Mixing ratio 2-stroke motor oil : super fuel 1:40 – 1:60. Basic information on a change of the carburetor setting Always start out from the original carburetor setting. Essential requirements are a clean air filter system, air-tight exhaust system and an intact carburetor. Experience has shown that adjusting the main jet, the idling jet and the jet needle is sufficient and that changes of other parts of the carburetor will not greatly affect engine performance. RULE OF THUMB:

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Thanks to a history of competition successes, particularly in off-road racing, KTM motorcycles enjoy a large and loyal following. Established in 1953, KTM (from Kraftfahrzeuge Trunkenpolz Mattighofen where founder, Hans Trunkenpolz, had his engineering works) went through difficult times in the early 1990s. After a takeover, the Austrian company emerged as KTM Sportmotorcycle AG and has gone from strength to strength in recent years. Mainstay of their range are their Enduro and Motocross models, the EXC and SX, and these are covered in the latest new manual from Haynes. Models covered are the 250, 400, 450, 520 and 525 EXC and SX with 4-stroke sohc engines, 2000 to 2007. Information has also been included on the SMR Supermoto versions and MXC/XC derivatives. Haynes Manuals for cars and motorcycles are so popular that 150 million have been sold worldwide. Lay them end-to-end and they would circle the globe at the equator! The new manual begins with essential pre-ride checks, competition prep and routine maintenance tasks before moving on to more major repairs. There are comprehensive, fully illustrated, instructions for overhauling the engine, transmission, brakes, suspension and electrical system. Useful reference pages include colour wiring diagrams, fault-finding charts and a comprehensive section on tools and workshop tips. Because all Haynes Manuals are based on a complete stripdown and rebuild, not only are the procedures written from first-hand experience, but there is information about special tools required for each job, and its complexity, plus Haynes tips for saving time and money. The new Haynes KTM EXC Enduro & SX Motocross Manual is the only complete manual for owners of these motorcycles.